Im not sure what "bear fashion" is (unless you mean "Bear Kilts" which is based in Vancouver)... but kilts are definatly NOT "*BEEP* fashion" (whatever that is).
Many people wear them for the comfort (ease of movement/breathability/lack of fabric rubbing on certain "parts"). Many people wear them as a show of pride in heritage (either as Scots or by wearing the many state and national tartans designed for the wear of anyone). Many wear them as a means to self expression. Many wear them on the numerous Kilt/tartan/Scot/Irish holidays out there (St Patricks day is a big one).
Even if its not a true kilt, the wearing of unbifucated garments by men is by no means limited to Scotland. The rigid structure of "mean wear pants" is pretty much a Rennesance european convention. The common practice in many countries is for men to wear a wrapped peice of cloth around their waists. This cloth is worn in many different ways depending on culture, but everyone from ancient Egyptians, to classical Greeks, to Chinese emperors, to samurai, to the Iroquois, Cherokee and Hopi, to many modern day Polynesians, Indonesians, and Africans. All wore/wear some type of "skirt" as their daily or cerimonial dress.
I dont know if thats "authoritative", but its certainly my take on the subject.
"A man in a kilt is a man and a half."
~ Sir Colin Campbell, Brigadier-General
The Queen's 93rd 'Sutherland' Highlanders